You seem to be missing the point over and over again.
God -- in His omniscience -- KNOWS all things. But God is not man and did not go through human experiences until Christ became a Man and was subjected to temptations and suffering. That is when God EXPERIENCED the experiences of humanity. This was a necessity to make Christ "complete" as the Savior (as stated in Hebrews), since His sufferings and His humiliations were all a part of the price He paid for our redemption. This was His humanity, not His divinity, and we see His humanity on display in the Garden of Gethsemane. The writer to the Hebrews also makes reference to this.
Here is an analogy. Your friend has been in a car accident and suffered tremendous injuries, but you have never been in a car accident. While you may "know" all about the sufferings mentally, you cannot know the experience physically until you yourself are in a similar accident.
God -- in His omniscience -- KNOWS all things. But God is not man and did not go through human experiences until Christ became a Man and was subjected to temptations and suffering. That is when God EXPERIENCED the experiences of humanity. This was a necessity to make Christ "complete" as the Savior (as stated in Hebrews), since His sufferings and His humiliations were all a part of the price He paid for our redemption. This was His humanity, not His divinity, and we see His humanity on display in the Garden of Gethsemane. The writer to the Hebrews also makes reference to this.
Here is an analogy. Your friend has been in a car accident and suffered tremendous injuries, but you have never been in a car accident. While you may "know" all about the sufferings mentally, you cannot know the experience physically until you yourself are in a similar accident.
God sent the perfect driver, seeing things perfectly clear He sees the danger ahead and makes the necassary adjustments He arrives Home safely. This man is Jesus. Having driven safely Home, He is able to instruct others to Not drink and drive, ( repent) and to follow His path because it is safe.( Obey Him) God had never driven the flesh of man until Jesus came. God created the car but until He drove the broken car,( flesh) He was not able to soccour the helpless. He Knew the path, Knew the issue, But the High priest is the One who fixed the broken car, and drove it Home safely following the creators path.
it behoved Him to do this. meaning it was of necessaty for us that God experienced things through His Son, made flesh and blood.
1 john 5:6 "This is he that came by water and blood, even Jesus Christ; not by water only, but by water and blood. And it is the Spirit that beareth witness, because the Spirit is truth.
john 4:24 "God is a Spirit: and they that worship him must worship him in spirit and in truth.
temptation cannot be faced By God He is spirit, temptation requires flesh in order to tempt
james1 Blessed is the man that endureth temptation: for when he is tried, he shall receive the crown of life, which the Lord hath promised to them that love him.
13Let no man say when he is tempted, I am tempted of God: for God cannot be tempted with evil, neither tempteth he any man: 14But every man is tempted, when he is drawn away of his own lust, and enticed. 15Then when lust hath conceived, it bringeth forth sin: and sin, when it is finished, bringeth forth death
the solution is to overcome temptation as Jesus did, all flesh will face it, Jesus is able to soccour us to overcome it. thats where overcoming sin happens in the Mind and Heart. satan is the tempter, and we " submit to God, resiust the devil and He will flee" all flesh is corrupt it will all be tempted, we either learn from the One who overcame and live, or we follow temptation to sin and then death.